Radio apparatus



April 9, 1929- E. G. GAGE 1,70 8,538

RADIO APPARATUS Filed May 12. 1922 2 Sheets-Sheet 1 April 9, 1929. E. G. GAGE RADIO APPARAQPUS Filed May 12. 1922 2 Sheets-Sheet 2 IN V EN TOR Patented Apr. 9, 1929.

UNITED STATES PATENT OFFICE.

EDWARD G. GAGE, OF BROOKLYN, NEW YORK, ASSIGNOR OF ONE-HALF TO LLOYD Q. SLOCUMB, OF FERGUSON, MISSOURI, AND ONE-HALF TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE.

RADIO APPARATUS.

Application filed May 12, 1922. Serial No. 560,298.

This invention relates to the relative construction and adjustment of the coils for inductively relating different circuits or different parts of the same circuit,and means for varying the oscillation period of a circuit. Elie invention is especially useful in connection with radio telephone and telegraph systems but may have other applications.

As is well known devices are employed for inductively connecting different portions of radio apparatus, such devices comprising one coil commonly designated as the primary and a second coil commonly designated as the secondary and these coils are so relatively movable that they can be brought into such desired relationship that the coupling may be made as loose or close as desired.

2 means for varying the oscillation period of the circuit such as by varying the capacity or inductance, or both.

Such devices are usually mounted upon a board. It is the main object of the present invention to so combine such coil structures with the panel board on which it is mounted and with the adjusting means for the oscillation period that desired adjustments may be effected as quickly and conveniently as '30 possible. I

The above object may be attained by pro viding an improved coil structure and mounting, thus one of thexcoils may be pivotally mounted and upon the pivotally mounted section is also mounted means for tuning i. e. .varying the oscillation period as by varying the number of turns of the coil or a condenser or other suitable means. This may be conveniently accomplished by pi'votally mounting one section of the panel board, mounting one of the coils thereon and also mounting thereon the'tuning means.

The handle for the tuning means may also be used to turn the coil on its pivot to vary the coupling whereby convenience and speed in operation is attained. Furthermore the pivotal mounting permits any desired adjustment of the coupling without causing undue projection of the parts from the face of the panel at any time so that the apparatus is compact.

It is also usual to provide Other and ancillary objects of the invention will appear hereinafter.

In the accompanying drawings which illustrate the invention- Fig. 1 is a perspective view of a cabinet for a radio telephone receiver set, the front of which constitutes a panel whereon apparatus according to the present invention is mounted, certain parts of the set being omitted for the sake of clearness';

Fig. 2 is a top plan view, on an enlarged scale, of the apparatus of Fig. 1 with the top cover of the cabinet removed and partly broken away;

1 Fig. 3 is an elevation looking from the left of Fig. 2;

Fig. 4 is an elevation looking from the right of Fig. 2;

vFig. 5 is a front elevation of a portion of the panel; 7

Fig. 6 is a diagram of electrical connections showingthe manner of connecting the improved apparatus in a radio circuit; and

Fig. 7 is a view similar to Fig. 2 showing a modified form of period varying means.

Referring to the drawings, andfirst to Figs. 1 to 6 inclusive, the radio receiving settherein shown comprises a cabinet having its front formed by the panel board 1 while apparatus on the back of the panel board is enclosed in a housing 2. Certain of the usual parts of a set of this character are omitted from the drawings as they do not aid in illustrating the present invention, and on the other hand would complicate it. Upon the back of the panel board 1 which is made of wood fiber or other suitable material is mounted the primary coil 3 by means of a bracket a of any suitable construction. The coil 3 is stationary but the number of effective turns in the coil may be varied by taps 5 from different points in the coil which taps are respectively connected with the contact buttons or points 6, respectively adapted to engage with one end of the metal contact arm 7, the other end of this arm connecting with the contact segment 8 to which a suitable circuit connection is made, an example of which will be hereinafter referred to.

It. will be apparent that the number of turns of the coil 3 included in the circuit for. the switch mechanism comprisingthe' will depend upon the position of the arm 7 and that these turns may be increased or diminished by turning the arm in one direction or the other by means of a suitable insulating handle 9.

To provide suitable insulating mounting contacts 6 and 8 a disk 10 of bakelite may be inserted in the panel. 1

The secondary coil 11 0'1 in inductive relation to the coil 3, and is mounted upon a bracket 12 adapted to swing on pivots 13 and-14L on the panel board. The coil 11 can swing back and forth on its pivots telescoping with the coil 3 and the .coupling may be as loose or as close as desired. A spring 15 interposed between the bracket 12 and pin'16in the extended end of the pivot at 14 causes a frictional action or brake upon thebracket so that the cell will not accidentally be dislodged from any position to which it may be adjusted.

Secured to the bracket 12 is another bake lite disk 17 mounted in a correspondingly shaped opening in the panel board but hav-, ing sufficient clearance so that it may not interfere with the movement of the pivoted structure as referred to. Mounted upon the bakelite disk 17' is a segmental contact 18 engaging one end of the contact arm 19,

the other end of that arm successively engaging with the contacts 20 as the army 19 is turned in one direction or the other by means of the insulating handle 21. The

contacts 20 are respectively connected by means of taps 22 with suitable separated points of the coil 11. H V

It will now be seen that the handle21 can be grasped and the pivoted structure turned in one direction or the other so as to more intimately or remotely associate the coils 3 and 11 and thereby make the coupling as loose or as close as may be desired.

Also this same handle may be employed to vary the number 7 of turns of the coil 11 which are in circuit and so tune the circuit to the desired period. By providing a com mon handle for thus varying thecoupling and for tumngthe apparatus,conven1ence and speed .of adjustment are very greatly "enhanced. Furthermore, withthe structure shown, it will be seen that the movable structure comprising the adjustable coil 11 doesnot move perpendicular tothe panel sothat the operating handle is always easily accessible from the front of the panel. This 7 is of advantage as compared with, for instance, an arrangen'ient whereby the mov able 0011 is moved in a path perpendicular to the panel to adjust the coupling because,

in the last mentioned "case, the handle is liable to'be pushed so far in as'not to be accessible or moved so far out as to form an awkward and easily damaged projection.

the coupling is In the structure of the drawings the ad- 7 justable coil 11, it will be observed, has a motion which has a component horizontal to thefpanel.

It is also to be observed that tuningmay be accomplished by variation of the turns of the coil 3 in circuit by turning the handie 9 i as before referred to.

eterring now to Fig- 6 it will be seen that the aerial 23 is connected. with the segi'nent 8 whence connectionis made by the contact arm 7 with one of the contacts ,6 and thence through the coil 3 to the ground at 24-, the number of turns of the coil 3 included between the aerial and ground depending upon the position of the arm 7. r i r The coil 11, as before stated, hastaps con-' nected. respectively with the contacts 20, I the coil 11 being connected in any suitable secondary or closed oscillation'c-ircuit by means of leads 2e and 25, one of which is connected with the contact segment 18 and the other with one of the ends of the coil 11. It will be apparent that tuning of the oscillation circuit may; be accomplished by including a greater or less number of turns of the coil 11 in circuit in a manner as be-' fore described. The oscillation-circuit here shown includmg the conductors 24 and 25 is the input circuit of a vacuum tube .wherein the circuit is completed across the intervening space from the filament'to the grid.

the oscillation circuit is effected by the variablecondenser 26, which may be of any suitable or well known construction connected in series in the circuit, and themovable member of which may be turned by means of a handle 21' mounted upon the 'bakelite disk 17' which in turn is mounted upon the pivoted bracket 12 carrying the secondary coil 11 in a manner as described in connection with Figs. 1 to 6 inclusive. It will be seenfthat in this case the pivoted member comprises the panel section 17, condenser, 26 and the secondary coil 11' and as Referring now to Fig. 7, the tuning of its pivoted member is swung the coil 11' is j brought into more or less intimate relation with the primary coil 3 which may be mounted and adjusted as described incon nection with Figs. 1 to 6 inclusive.

While the invention has been illustrated in what are considered its best applications it. may ,have other embodiments without deil'iore limited to the structures shown in the parting. from its spirit and is'not there for varying the number of efiective turns on said second coil, said second coil and said turn varying m ans being turnable together on said pivot, said pivot being between said second coil and said turn :varying means.

2. The combination With a coil, of a piv otally mounted second coil in inductive relation thereto and adapted to be moved to vary the coupling between said coils, means for varying the number of effective turns on said second coil and a common means for turning said second coil on its pivot and operating said turn varying means, said pivot being between said second coil and said turn varying means.

The combination With a panel board, of a coil mounted thereon, a second coil movably mounted upon said board, said coils being in inductive relation and'adapted to have said relation varied by relatively moving said coils, said second coil being mounted to move in a path having a component parallel to said panel board, means for varying the effective turns of said second coil and common means for moving said second coil and operating saic turn varying means, said common means and coil being on opposite sides of said panel board.

4. The combination With a panel board, of a coil mounted thereon, a second coil movably mounted upon said board, said coils being in inductive relation and adapted to to and movable with said second coil andmounted on the opposite side of said panel board therefrom.

5. The combination With a panel board having a movable section, of a coil, a pivotally mounted second coil in inductive relation thereto and adapted to be moved to vary the coupling between said coils, means for varying the number of effective turns on said second coil, said second coil, turn varying means and movable panel section being turnable together on said pivot and said second coil and turnvarying means being on opposite sides of said section.

6. In a radio receiving set the combination with a panel having an opening, of a circuit tuning means and a coupling varying means both mounted to turn on a single axis, which axis is substantially lying in or parallel to said panel, and means for operating both said means extending from one side of said panel to the other.

In testimony vvhereoi l have signed this specification this 10th day or May, 1922.

EDWVARD G. GAGE. 

